Knowledge Demon

• HP: 379 (Ascension: 399)
• Appears in: Lair
• Cycle: 4-turn loop

One of Act 2's hardest bosses. High HP plus a 4-turn debuff-choice gimmick crushes passive decks under heal and Strength accumulation. Aggressive play aimed at a short kill is the baseline approach.

Runs a fixed 4-turn loop.

Debuff-choice options shift as the fight progresses.

Early options:

• Collapse: take 6 damage per turn
• Mind Rot: draw 1 fewer card per turn

Late options:

• Sloth: play only 3 cards that turn
• Drain: max Energy reduced

For debuff-choice, Collapse is usually the stable pick. 6 damage per turn hurts but is predictable and manageable. Mind Rot's draw reduction impacts your entire deck flow, so it becomes increasingly lethal the longer the fight.

Turn 4 Recovery Attack is the most dangerous action. 11 damage itself is small, but the heal plus permanent 2 Strength stacking is the problem. Each cycle stacks Strength to 2, 4, 6, pumping turn 2 and 3 damage. That's why passive decks lose — you need to aim for a short fight.

Turn 3 Triple Strike (8x3=24) has many hits, so thorn/Flame Barrier-style reflect damage shines. 3 ticks of reflect go off, giving you offense-in-defense.

Sloth (3-card limit) and Drain (Energy reduction) are both brutal late-game debuffs. Reaching that point means the fight already went too long, so aggression from the start to reduce cycle count is the core solution.

• Ironclad: Strength buff scaling enables the short fight. Flame Barrier stacks reflect damage on Triple Strike. Collapse's 6/turn is survivable with high HP pool.
• Silent: Poison chip damage works well against high HP. Mind Rot's draw reduction is especially lethal for Silent, so pick Collapse. Leg Sweep's Vulnerable also softens Triple Strike.
• Defect: Orb damage isn't affected by card restrictions. Frost Orbs Block Triple Strike while Lightning or Dark chip HP. Close the fight before late-game debuffs.
• Necrobinder: Minions add volume and close the kill before Strength stacks too high. Watch Collapse's self-damage alongside your HP.
• Regent: Deploy Powers early for reliable chip damage. Powers aren't affected by debuffs, so losing tempo on turn 1 Demon's Choice is easy to recover from.